FFmpeg
api-band-test.c
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1 /*
2  * Copyright (c) 2015 Ludmila Glinskih
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  * THE SOFTWARE.
21  */
22 
23 /**
24  * draw_horiz_band test.
25  */
26 
27 #include "libavutil/adler32.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavformat/avformat.h"
30 #include "libavutil/imgutils.h"
31 
35 
36 static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4],
37  int slice_position, int type, int height)
38 {
39  int i;
40  const AVPixFmtDescriptor *pix_fmt_desc;
41  int chroma_w, chroma_h;
42  int shift_slice_position;
43  int shift_height;
44 
46 
47  pix_fmt_desc = av_pix_fmt_desc_get(ctx->pix_fmt);
48  chroma_w = -((-ctx->width) >> pix_fmt_desc->log2_chroma_w);
49  chroma_h = -((-height) >> pix_fmt_desc->log2_chroma_h);
50  shift_slice_position = -((-slice_position) >> pix_fmt_desc->log2_chroma_h);
51  shift_height = -((-ctx->height) >> pix_fmt_desc->log2_chroma_h);
52 
53  for (i = 0; i < height; i++) {
54  memcpy(slice_byte_buffer + ctx->width * slice_position + i * ctx->width,
55  fr->data[0] + offset[0] + i * fr->linesize[0], ctx->width);
56  }
57  for (i = 0; i < chroma_h; i++) {
58  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_slice_position + i * chroma_w,
59  fr->data[1] + offset[1] + i * fr->linesize[1], chroma_w);
60  }
61  for (i = 0; i < chroma_h; i++) {
62  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_height + chroma_w * shift_slice_position + i * chroma_w,
63  fr->data[2] + offset[2] + i * fr->linesize[2], chroma_w);
64  }
65 }
66 
67 static int video_decode(const char *input_filename)
68 {
69  AVCodec *codec = NULL;
71  AVCodecParameters *origin_par = NULL;
72  uint8_t *byte_buffer = NULL;
73  AVFrame *fr = NULL;
74  AVPacket pkt;
76  int number_of_written_bytes;
77  int video_stream;
78  int got_frame = 0;
79  int byte_buffer_size;
80  int result;
81  int end_of_stream = 0;
82 
84 
86  if (result < 0) {
87  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
88  return result;
89  }
90 
92  if (result < 0) {
93  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
94  return result;
95  }
96 
98  if (video_stream < 0) {
99  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
100  return -1;
101  }
102 
103  origin_par = fmt_ctx->streams[video_stream]->codecpar;
104 
105  codec = avcodec_find_decoder(origin_par->codec_id);
106  if (!codec) {
107  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
108  return -1;
109  }
110 
111  ctx = avcodec_alloc_context3(codec);
112  if (!ctx) {
113  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
114  return AVERROR(ENOMEM);
115  }
116 
118  if (result) {
119  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
120  return result;
121  }
122 
123  ctx->draw_horiz_band = draw_horiz_band;
124  ctx->thread_count = 1;
125 
126  result = avcodec_open2(ctx, codec, NULL);
127  if (result < 0) {
128  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
129  return result;
130  }
131 
132  fr = av_frame_alloc();
133  if (!fr) {
134  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
135  return AVERROR(ENOMEM);
136  }
137 
138  if (strcmp(codec->name, "flv") && strcmp(codec->name, "mpeg4") && strcmp(codec->name, "huffyuv")) {
139  av_log(NULL, AV_LOG_ERROR, "Wrong codec\n");
140  return -1;
141  }
142 
143  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 32);
144  byte_buffer = av_malloc(byte_buffer_size);
145  if (!byte_buffer) {
146  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
147  return AVERROR(ENOMEM);
148  }
149 
150  slice_byte_buffer = av_malloc(byte_buffer_size);
151  if (!slice_byte_buffer) {
152  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
153  return AVERROR(ENOMEM);
154  }
155  memset(slice_byte_buffer, 0, byte_buffer_size);
156  slice_byte_buffer_size = byte_buffer_size;
157 
159  do {
160  if (!end_of_stream) {
161  if (av_read_frame(fmt_ctx, &pkt) < 0) {
162  end_of_stream = 1;
163  }
164  }
165  if (end_of_stream) {
166  pkt.data = NULL;
167  pkt.size = 0;
168  }
170  got_frame = 0;
171  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
172  if (result < 0) {
173  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
174  return result;
175  }
176  if (got_frame) {
177  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
178  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
179  ctx->pix_fmt, ctx->width, ctx->height, 1);
180  if (number_of_written_bytes < 0) {
181  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
182  return number_of_written_bytes;
183  }
184  if (draw_horiz_band_called == 0) {
185  av_log(NULL, AV_LOG_ERROR, "draw_horiz_band haven't been called!\n");
186  return -1;
187  }
188  if (av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes) !=
189  av_adler32_update(0, (const uint8_t*)slice_byte_buffer, number_of_written_bytes)) {
190  av_log(NULL, AV_LOG_ERROR, "Decoded frames with and without draw_horiz_band are not the same!\n");
191  return -1;
192  }
193  }
196  }
197  } while (!end_of_stream || got_frame);
198 
200  av_frame_free(&fr);
204  av_freep(&byte_buffer);
206  return 0;
207 }
208 
209 int main(int argc, char **argv)
210 {
211  if (argc < 2)
212  {
213  av_log(NULL, AV_LOG_ERROR, "Incorrect input: expected %s <name of a video file>\nNote that test works only for huffyuv, flv and mpeg4 decoders\n", argv[0]);
214  return 1;
215  }
216 
217  if (video_decode(argv[1]) != 0)
218  return 1;
219 
220  return 0;
221 }
avcodec_close
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:1117
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
AVCodec
AVCodec.
Definition: avcodec.h:3481
draw_horiz_band
static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4], int slice_position, int type, int height)
Definition: api-band-test.c:36
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3949
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1785
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4452
video_decode
static int video_decode(const char *input_filename)
Definition: api-band-test.c:67
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:156
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVPixFmtDescriptor::log2_chroma_w
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1017
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
slice_byte_buffer
uint8_t * slice_byte_buffer
draw_horiz_band test.
Definition: api-band-test.c:32
fmt_ctx
static AVFormatContext * fmt_ctx
Definition: demuxing_decoding.c:37
main
int main(int argc, char **argv)
Definition: api-band-test.c:209
avcodec_free_context
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Definition: options.c:171
end_of_stream
static int FUNC() end_of_stream(CodedBitstreamContext *ctx, RWContext *rw, H264RawNALUnitHeader *current)
Definition: cbs_h264_syntax_template.c:1419
adler32.h
avcodec_open2
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:565
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3588
AVPacket::size
int size
Definition: avcodec.h:1478
avcodec_find_decoder
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:890
height
#define height
av_image_get_buffer_size
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters.
Definition: imgutils.c:431
slice_byte_buffer_size
uint8_t slice_byte_buffer_size
Definition: api-band-test.c:33
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:540
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int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: utils.c:2155
avcodec_decode_video2
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: decode.c:898
draw_horiz_band_called
int draw_horiz_band_called
Definition: api-band-test.c:34
uint8_t
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Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
avcodec.h
video_stream
static AVStream * video_stream
Definition: demuxing_decoding.c:41
avformat.h
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
av_adler32_update
unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf, unsigned int len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1479
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static const char * input_filename
Definition: ffplay.c:311
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
av_image_copy_to_buffer
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
Definition: imgutils.c:453
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVPixFmtDescriptor::log2_chroma_h
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
av_init_packet
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
av_find_best_stream
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
Definition: utils.c:4207